package thread;

import java.util.ArrayList;

public class Test {
    public static void main(String[] args)  {
        ArrayList<Integer> list=new ArrayList<>();
        Thread t1=new Thread(){
            @Override
            public void run() {

                for(int i=0;i<10000;i++){
                    synchronized (list) {
                        list.add(i);
                    }
                }


            }
        };

        Thread t2=new Thread(){
            public void run(){
                for(int i=0;i<10000;i++){
                    synchronized (list){
                        list.add(i);
                    }

                }


            }
        };
        t1.start();
        t2.start();

        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        System.out.println(list.size());
    }
/*
    public synchronized void plus(ArrayList<Integer> list){
        for(int i=0;i<10000;i++){
            list.add(i);
        }
    }

 */
}
